5 Minute Check Solve. Complete in your notebook. 1. 115 + d = 576 2. x - 145 = 537 3. 140c = 35 4. = 23.

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Presentation transcript:

5 Minute Check Solve. Complete in your notebook d = x = c = = 23

5 Minute Check Solve. Complete in your notebook d = 576

5 Minute Check Solve. Complete in your notebook d = d = 461

5 Minute Check Solve. Complete in your notebook. 2. x = 537

5 Minute Check Solve. Complete in your notebook. 2. x = x = 682

5 Minute Check Solve. Complete in your notebook c = 35

5 Minute Check Solve. Complete in your notebook c = c =

5 Minute Check Solve. Complete in your notebook. 4. = 23

5 Minute Check Solve. Complete in your notebook · = 23 · 35 t = 805

Thursday, Feb 27 Chapter13-1 Angles

Objective: To draw and label angles.

Angles Angles are measured in degrees. One degree is 1/360 of a circle. (Or there are 360 degrees in a circle).

Angles Angles have two sides that share a common endpoint called a vertex. vertex

Angles A right angle measures 90°. (Draw angle in notes.) Right angle symbol

Angles A straight angle measures 180°. (Draw angle in notes.)

Angles An obtuse angle measures between 90° and 180°. (Draw angle in notes.)

Angles An acute angle measures between 0°and 90°. (Draw angle in notes.)

Angles An angle of 89 ° is what type of angle?

Angles An angle of 89 ° is what type of angle? Since 89 ° is between 0 ° and 90 °, it is an acute angle.

Angles An angle of 90 ° is what type of angle?

Angles An angle of 90 ° is what type of angle? 90 ° is a right angle.

Angles An angle of 114 ° is what type of angle?

Angles An angle of 114 ° is what type of angle? Since 114 ° is between 90 ° and 180 °, it is an obtuse angle.

Angles Is this angle right, straight, obtuse or acute?

Angles Is this angle right, straight, obtuse or acute? Since the angle is less than 90°, it is acute.

Angles Is this angle right, straight, obtuse or acute?

Angles Is this angle right, straight, obtuse or acute? Since the angle is 180°, it is straight.

Angles Is this angle right, straight, obtuse or acute?

Angles Is this angle right, straight, obtuse or acute? Since the angle has the “right angle symbol”, it must be a right angle.

Angles Two angles are complementary if the sum of their angles is 90 °. Two angles are supplementary if the sum of their angles is 180 °.

Angles Angles A and B are complementary. If m A = 25 °, what is m B?

Angles Angles A and B are complementary. If m A = 25 °, what is m B? 90° - 25° = m B 65 ° = m B

Angles Angles M and N are supplementary. If m M = 85 °, what is the measure of N?

Angles Angles M and N are supplementary. If m M = 85 °, what is the measure of N? M + N = 180 ° 85 ° + N = 180 ° N = 95 °

Angles Angles C and D are complementary. If m C = 47 °, what is the measure of D?

Angles Angles C and D are complementary. If m C = 47 °, what is the measure of D? C + D = 90 ° 47 ° + D = 90 ° D = 43 °

Angles Angles A and B are supplementary. If m A = 127 °, what is the measure of B?

Angles Angles A and B are supplementary. If m A = 127 °, what is the measure of B? A + B = 180 ° 127 ° + B = 180 ° B = 53 °

Angles Angles F and G are supplementary. If m F = 12 °, what is the measure of G?

Angles Angles F and G are supplementary. If m F = 12 °, what is the measure of G? F + G = 180 ° 12 ° + G = 180 ° G = 168 °

Angles If there are 360˚ in a circle and 12 hours on a clock, how many degrees is one hour?

Angles If there are 360˚ in a circle and 12 hours on a clock, how many degrees is one hour? 360˚ ÷ 12 = 30˚

Angles What is the angle formed by the hands of the clock at 2:00?

Angles What is the angle formed by the hands of the clock at 2:00? 60˚ or 300˚

Angles What is the angle formed by the hands of the clock at 9:00?

Angles What is the angle formed by the hands of the clock at 9:00? 90˚or 270 ˚

Angles What is the angle formed by the hands of the clock at 6:00?

Angles What is the angle formed by the hands of the clock at 6:00? 180 ˚

Angles Angles around a point will always add to 360˚.

Angles What is the unknown angle?

Angles What is the unknown angle? = 298, 360 – 298 = 62˚

Angles What is the unknown angle?

Angles What is the unknown angle? = 276, 360 – 276 = 84˚

Angles What is the unknown angle?

Angles What is the unknown angle? = 257, 360 – 257 = 103˚

Angles What is “x”?

Angles What is “x”? x + 2x + 3x + 4x +5x = 15x, 15x =360

Angles What is “x”? x + 2x + 3x + 4x +5x = 15x, 15x =360 15x = x = 24

Angles What did the acorn say when he grew up?

Angles What did the acorn say when he grew up? Answer: Geometry (Gee, I'm a tree!)

Angles Agenda Notes – Homework – Study Guide13-1 Due Friday, Feb 28 Just classify the angle, do not measure with a protractor. Mid-Chapter 13 Quiz Monday, March 3