HW: 3 area & perimeter Materials Tuesday, 2/21/17 Write the IC and HW in your planner. IC: Ch. 8.4 HW: 3 area & perimeter Show work on all !!!! Materials Pencil Slate, marker, eraser 1 1 1 1 1 1

Bellwork Find the area of the rectangles below: A = bh 3cm 0.25m 8cm 1. 2. 3cm 0.25m 8cm A = bh 1.5m A = 8(3) A = bh A = 24 cm² A = 1.5(0.25) 3. A = bh A = 0.375 m² ¾ mi A = ¾(¾) ¾ mi A = mi²

Bellwork Find the perimeter of the rectangles below: P = the sum of the sides 1. 2. 3cm 0.25m 8cm P = the sum of the sides 1.5m P = 8 + 3 + 8 + 3 P = the sum of the sides P = 22 cm P = 2(0.25) + 2(1.5) P = 0.5 + 3 m P = 3.5 m

Bellwork Find the area of the shaded regions below: A= bh 3cm 0.25m 1. 2. 3cm 0.25m 8cm A = ½ (24 cm²) 1.5m A = 12 cm² A = ½ (0.375 m²) A = 0.1875 m² 3. A = ½ (9/16 cm²) ¾ mi ¾ mi A = 9/32 cm²

Area and Perimeter of Composite Figures 7.G.6 – Chapter 8.4 Objective: TSWBAT find the area of composite figures using the formulas for rectangles and triangles. Date _____________________ Area and Perimeter of Composite Figures Formula for area of rectangles: A = bh Formula for area of triangles: A = ½bh A = ½ bh 12 in 5 in A = ½(16)(3) 3 in A = (8)(3) 16 in A = 24 in² P = the sum of the sides P = 5 + 16 + 12 P = 33 in

? ? ? ? 12 2 5 5 Ex. 1 1) Find the value of each question mark. 2) What shapes do you have? 12 2 12 ? ? Rectangle 5 5 5 A = bh Triangle A = ½ bh 3) Find the total area. Triangle Rectangle Total A = ½ bh A = bh 10 units² A = 2(5) A = ½ (12)(5) + 30 units² A = 10 units² A = 40 units² A = (6)(5) A = 30 units²

Ex. 2 10.5 ft 10.5 ft 5 ft 18 ft 10 ft 10 ft 18 ft Triangle Rectangle Total A = ½ bh A = bh 180 ft² A = 18(10) A = ½ (18)(5) + 45 ft² A = 180 ft² A = 225 ft² A = (9)(5) A = 45 ft²

Ex. 3 8 ft 8 ft 8 ft 6 ft 6 ft 6 ft 8 ft times 2 20 – 8 = 12 Triangle 12 ÷2 = 6 A = ½ bh Square Total A = ½ (6)(8) A = bh 64 ft² A = 8(8) A = (3)(8) + 24 ft² + 24 ft² A = 64 ft² A = 24 ft² A = 112 ft²

Ex. 3 What is the perimeter of the trapezoid measured in feet? P = sum of sides P = 20+10+8+10 P = 48 ft

Ex. 4 3 ft 4 ft 10 ft 4 ft 4 ft 8 ft 8 ft 8 ft 4 ft 19 – 4 = 15ft

Find the area. Ex. 5 Parallelogram A = bh A = 9(5) A = 45 in² Triangle Total A = ½ (4)(3.5) 45 in² A = (2)(3.5) + 7 in² A = 7 in² A = 52 in²