What is the solution of 4x 12-5x-30
1 answer:
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Answer:
a. 754cm³ (3 s.f.)
b. 415cm² (3 s.f.)
Step-by-step explanation:
Formulas (for easier reference):
Volume of cone: r²
Volume of hemisphere: r³
Surface area of cone without base: rl
Surface area of hemisphere without base: 2r²
We can just apply the formulas for the question:
Volume of toy = ( × 6² ×
) + (
×
6³)
= 96 + 144
= 240
= 754cm³ (3 s.f.)
Surface area of toy = ( × 6 × 10) + (2 ×
× 6²)
= 60 + 72
= 132
= 415cm² (3 s.f.)
