Area of Parallelograms, Triangles, and Rhombuses Unit 11 Section 2 Understand what is meant by the area of a polygon Know and use the formulas for the area of parallelograms, triangles, and rhombuses.

Area of Parallelogram Area = base x height to that base base height Example 1: Find the area of the figure. 60 ° 10 2

Example 2: Find the area of a parallelogram with base and corresponding height. Practice 1: Lesson 11.2 Notes #1-3

Area of a Triangle Area = ½ (base x height to that base) base height Example 3: Find the area of the figure. 9

Example 4: Find the area of a triangle with base 6.3 cm and corresponding height 9.8 cm. Practice: Lesson 11.2 Notes #4-6

Area of a Rhombus Area = ½ (product of its diagonals) d₁d₁ d₂d₂ Example 5: Find the area of the figure

Example 6: Find the area of a rhombus with diagonals 16 and 8. Practice: Lesson Notes 11.2 #7-8

Closure Match the area formula with the name ____ 1) rectangle A) A = Πr 2 ____ 2) square B) A = ½ b h ____ 3) parallelogram C) A = ½ d 1 d 2 ____ 4) triangleD) A = s 2 ____ 5) rhombusE) A = ½ Pa F) A = l w G) A = __x_ Πr H) A = b h I) A = ½ h (b 1 + b 2 ) Homework: Practice Worksheet