Presentation on theme: "Click the mouse button or press the Space Bar to display the answers."— Presentation transcript:
1 Click the mouse button or press the Space Bar to display the answers. Transparency 11-25-Minute Check on Lesson 11-1Find the area and the perimeter of each parallelogram. Round to the nearest tenth if necessary.2.TRY: Find the height and base of this parallelogram if the area is 168 square units11 cm13 cm45°17 ft12 ft6.3 m60°11 in18 inx + 2xClick the mouse button or press the Space Bar to display the answers.
3 Area of Triangles A = ½ * b * h h is height (altitude) Triangle AreaA = ½ * b * hh is height (altitude)b is base (┴ to h)hSTW
4 EXAMPLE 1RFind the area of triangle RSTh45°ST10W10
5 EXAMPLE 2Find the area of quadrilateral ABCD if AC = 35, BF = 18, and DE = 10.Example 2-1a
6 EXAMPLE 3Find the area of quadrilateral HIJK if IK = 16, HL = 5 and JM = 9Example 2-1b
7 EXAMPLE 4Find the area of the triangle whose vertices are (3,6), (7,6) and (3,1).
8 EXAMPLE 5Find the area of the parallelogram whose vertices are (0,0), (4,0), (5,5), and (1,5)
9 Summary & Homework Summary: Classwork: YOU MUST SHOW WORK!!!!! The formula for the area of a triangle can be used to find the areas of many different figuresCongruent figures have equal areasClasswork: 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!!!