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5-Minute Check on Lesson 11-1 Transparency 11-2 Click the mouse button or press the Space Bar to display the answers. Find the area and the perimeter of each parallelogram. Round to the nearest tenth if necessary. 1. 2. 3. 4. TRY: Find the height and base of this parallelogram if the area is 168 square units 11 cm 13 cm 45° 60° 11 in 18 in x + 2 x 6.3 m 17 ft 12 ft

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Lesson 11-2 Day 1 Areas of Triangles

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Area of Triangles Triangle Area A = ½ * b * h h is height (altitude) b is base ( to h) R S T W h

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EXAMPLE 1 R S T W h Find the area of triangle RST 10 45°

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Example 2-1a Find the area of quadrilateral ABCD if AC = 35, BF = 18, and DE = 10. EXAMPLE 2

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Example 2-1b Find the area of quadrilateral HIJK if IK = 16, HL = 5 and JM = 9 EXAMPLE 3

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EXAMPLE 4 Find the area of the triangle whose vertices are (3,6), (7,6) and (3,1).

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EXAMPLE 5 Find the area of the parallelogram whose vertices are (0,0), (4,0), (5,5), and (1,5)

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Summary & Homework Summary: The formula for the area of a triangle can be used to find the areas of many different figures Congruent figures have equal areas Classwork: YOU MUST SHOW WORK!!!!! pg 605 (5,13, 14, 19, 20, 34, 35) pg 599 (21-25 and page 605 #7) Plot points first then find the area of each!!!

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