Geometry: Directions Please have out your homework from Friday!

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Presentation transcript:

Geometry: Directions Please have out your homework from Friday! Please have a color and your calculator on your desk! You will need paper and a pencil for notes today.

WARM UP: 1. Find the area of the figure. Round to the nearest tenth if necessary. 48cm 2. Find the perimeter of the figure. Round to the nearest tenth if necessary. 3.4cm² 5-Minute Check 1

Area of Trapezoids!

Ex: 1 Find the area of steel used to make the side of the razor blade shown below.

You Try! Find the area of the side of the pool outlined below. A. 288 ft2 B. 295.5 ft2 C. 302.5 ft2 D. 310 ft2

Ex: 2 Real World: Miguel designed a deck shaped like the trapezoid shown below. Find the area of the deck. We are missing base 2! How can we find it? USE RIGHT TRIANGLES! 6ft Therefore…since the base of our triangle is 3, and base 1 of the trapezoid is 9… 3ft Then base 2 of the trapezoid is 6!

Continued… 3ft 6ft

Find the perimeter of the isosceles trapezoid! Use the right triangle to help determine the length of the legs! 29 5 5 h=4 The right triangles are 3-4-5’s! 3 3 35

Area of Rhombi & Kites

EX:2 Find the area of the kite.

Ex: 4 Find the area of the rhombus. 9in 7in

YOU TRY! Find the area of the kite. A. 48.75 ft2 B. 58.5 ft2 C. 75.25 ft2 D. 117 ft2

You Try! Find the area of the rhombus. A. 45 in2 B. 90 in2 C. 180 in2 D. 360 in2

Challenge: One diagonal of a rhombus is half as long as the other diagonal. If the area of the rhombus is 64 square inches, what are the lengths of the diagonals?

You Try! Trapezoid QRST has an area of 210 square yards. Find the height of QRST. A. 3 yd B. 6 yd C. 2.1 yd D. 7 yd

Changing Dimensions If the dimensions of the trapezoid below are doubled, what is the effect on the area and perimeter? The area would be quadrupled. The perimeter would be doubled.

Concept 3