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alecnewman2002
26.06.2020 •
Mathematics
I need help finding the surface area, can someone help
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Ответ:
1). Surface area of the prism = 112 cm²
2). Area of the sphere = 615.8 cm²
Step-by-step explanation:
1). Surface area of the triangular prism = Area of the triangular bases + Area of three lateral (rectangular) sides
Area of a triangular base =![\frac{1}{2}(\text{Base})(\text{Height})](/tpl/images/0694/3805/7363f.png)
=![\frac{1}{2}(3)(7)](/tpl/images/0694/3805/ad9fa.png)
= 10.5 cm²
Area of a rectangle = Length × width
Area of the rectangular lateral sides = (3 × 5) + (8 × 5) + (7 × 5)
= 15 + 40 + 35
= 90 cm²
Surface area of the prism = (2 × 10.5) + 90
= 21 + 90
= 112 cm²
2). Surface area of the sphere = 4πr²
= 4π(7)²
= 615.75
≈ 615.8 cm²
Ответ:
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