Bell Work 1. A circle has a circumference of about 50.27in. What is the circle’s area? Round to the nearest hundredth. 2. Solve for x if m  ABD= 40.5 o.

Tri-Math-Alon: Ch. 1 Round 1: Formulas and Definitions Round 2: Angles and Segments Round 3: Area, Midpoint, & Distance

Rules Divide yourself up into teams of 3 or 4. Do NOT move desks! Round 1 is the speed round. The first team to write the FULL, CORRECT answer LEGIBLY will earn 1 point. The writer must switch after each question. Rounds 2 & 3 you will work as a group to answer the question in a given amount of time. When time is called, hold up your answer board. ALL teams with the correct answer will get 2 points. Answers must be rounded correctly and use the correct units where applicable. All participants get a 10/10 participation grade. Winners get extra credit on today’s grade! 1 st place = 5 pts, 2 nd place = 3 pts

Round 1 Question 1: Formulas & Definitions Fill in the blank: To ____ is the action of cutting something in half.

Round 1 Question 2: Formulas & Definitions Fill in the blank: A ____ is a portion of a line including 2 endpoints and all points between.

Round 1 Question 3: Formulas & Definitions Fill in the blank: ____ is an adjective meaning “on the same line”

Round 1 Question 4: Formulas & Definitions Fill in the blank: A ____ is the point located in the exact middle of a segment.

Round 1 Question 5: Formulas & Definitions Fill in the blank: ____ _____ are two rays that share a common endpoint and form a line.

Round 1 Question 6: Formulas & Definitions What is the COMPLETE formula for finding the circumference of a circle?

Round 1 Question 7: Formulas & Definitions What is the COMPLETE formula for the area of a triangle?

Round 1 Question 8: Formulas & Definitions What is the COMPLETE formula for the area of a circle?

Round 1 Question 9: Formulas & Definitions What is the COMPLETE formula for finding the distance between 2 points on a coordinate plane?

Round 1 Question 10: Formulas & Definitions What is the COMPLETE formula for finding the midpoint of a segment?

Round 1 Is Done!

Round 2 Question 1: Angles and Segments Solve for x.

Round 2 Question 2: Angles and Segments The m  ADC = 68 o. What is the m  BDC?

Round 2 Question 3: Angles and Segments Solve for x.

Round 2 Question 4: Angles and Segments What is AB?

Round 2 Question 5: Angles and Segments

Round 2 Question 6: Angles and Segments Draw all of the following angle pairs (label accordingly): a) Vertical angles b) Linear pair c) Adjacent angles that are not a linear pair

Round 2 Question 7: Angles and Segments Solve for x.

Round 2 Question 8: Angles and Segments Which equation is incorrect? A. m  ACB + m  ACD + m  DCE = 180 B. m  ACB = m  ACD + m  DCE C. m  ACD = m  FCG

Round 2 Question 9: Angles and Segments You are standing in a straight line for the new roller coaster at Sea World. There is a vending machine at the midpoint between you and the air conditioned part of the line. If you are (5x + 9)ft away from the vending machine and the vending machine is (2x + 30)ft away from the door, how many feet away are you from air conditioned bliss?

Round 2 Is Through!

Round 3 Question 1: Area, Circumference, Distance, & Midpoint.

Round 3 Question 2: Area, Circumference, Distance, & Midpoint.

Round 3 Question 3: Area, Circumference, Distance, & Midpoint. What the area of this figure?

Round 3 Question 4: Area, Circumference, Distance, & Midpoint. How many inches of wire would it take to surround this figure? Round to the nearest hundredths.

Round 3 Question 5: Area, Circumference, Distance, & Midpoint.

Round 3 Question 6: Area, Circumference, Distance, & Midpoint. National City streets run east to west and avenues run north to south. One block is 1mi by 1mi. If Supergirl flies from 32 nd St. and 5 th Ave. to 6 th St. and 15 th Ave., how many miles did she fly? Round your answer to the nearest tenth of a mile if necessary.

Round 3 Question 7: Area, Circumference, Distance, & Midpoint. Brandon and Steven are lost in the woods. Brandon is at (2, 5) on his map and Steven is at (20, 29) on the same map. If there is a ranger station exactly half way between Brandon and Steven, what are the coordinates of the ranger station on the map?

Round 3 Question 8: Area, Circumference, Distance, & Midpoint. The adventure of Brandon and Steven continues! They both plan on heading to the ranger station. Recall that Brandon is at (2, 5) on his map and Steven is at (20, 29) on the same map. If the ranger station exactly half way between Brandon and Steven, how far are the boys from the ranger station? The map is measured in kilometers.

Round 3 Question 9: Area, Circumference, Distance, & Midpoint. What is the area of the heart? Round your answer to the nearest hundredth.

And the winner is…?

Answers Round 3: 1. (1/2, -2) 2. MN = 13 units 3. A = 70 units 2 4. about 3.57in 5. D = 25yds 6. D = 27.9 miles 7. (11, 17) 8. 15km 9. A = 7.14in 2