Lesson 10 7 surface area
- 1. Name ________________________________ Date __________________ Mrs. Labuski / Mrs. Rooney Period _____ Lesson 10-7 Surface Area VOCABULARY DEFINITION EXAMPLE Surface area Net To find the surface area of the triangular prism below, find the area of each face. Face C Face D Face E Face B Face A A = ½ bh A = ½ bh A = lw A = lw A = lw A = _________ A = _______ A = _________ A = ______ A = _______ A = _________ A = _______ A = _________ A = ______ A = _______ Continued on next page
- 2. Now add all of the areas together: Face A = 6 un2 Face B = 6 un2 Face C = 24 un2 Face D = 24 un2 Face E = 24 un2 Surface Area = __________ Now you try: Side Area = bh Top Area = bh Side Area = _________ Top Area = _________ Side Area = _________ Top Area = _________ x4 x2 ___________ ___________ Sides __________ + top __________ Surface area = ____________
- 5. Name ________________________________ Date __________________ Mrs. Labuski / Mrs. Rooney Period _____ Lesson 10-7 Surface Area VOCABULARY DEFINITION EXAMPLE The surface area of a solid Surface area figure is the sum of the See below areas of its surfaces A net is the pattern made when the surface of a Net solid is laid out flat showing each face of the figure. To find the surface area of the triangular prism below, find the area of each face. Face C Face D Face E Face B Face A A = ½ bh A = ½ bh A = lw A = lw A = lw A=½x3x4 A=½x3x4 A=6x4 A=6x4 A=6x4 A = 6 un2 A = 6 un2 A = 24 un2 A= 24 un2 A = 24 un2 Continued on next page
- 6. Now add all of the areas together: Face A = 6 un2 Face B = 6 un2 Face C = 24 un2 Face D = 24 un2 Face E = 24 un2 Surface Area = 86 un2 Now you try: Side Area = bh Top Area = bh Side Area = 10 x 8 Top Area = 8 x 8 Side Area = 80 Top Area = 64 x4 x2 320ft2 128ft2 Sides 320ft2 + top 128ft2 Surface area = 448ft2
- 7. 4 A = lw A = ½ bh A= 6x6 A=½x6x5 A = 36 un2 A = 15 un2 x4 A = 60 un2 Sides = 60 +Base = 36 Surface area = 96 un2 6 A = lw A = 10 x 10 A = 100 un2 x6 SA = 600 un2
- 8. 4 A = lw A = ½ bh A=6x6 A = ½ x 6 x 16 A = 36 un2 A = 48 un2 x4 A = 192 un2 Sides = 192 +Base = 36 Surface area = 228 un2 front & back 2 sides 2 2 2.4cm 2.4cm top & 1.8cm bottom 4.5cm 4.5cm 1.8cm 21.6 A = lw A = lw A = lw 8.64 A = 4.5 x 2.4 A = 1.8 x 2.4 A = 4.5 x 1.8 + 16.2 A = 10.8 cm2 A = 4.32 cm2 A = 8.1 cm2 46.44cm2 x2 x2 x2 A = 21.6 cm2 A = 8.64 cm2 A = 16.2 cm2