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Lady bird [3.3K]
3 years ago
9

Can someone please help me with this

Mathematics
1 answer:
Inessa05 [86]3 years ago
6 0
To find the area of a prism, you calculate the area of the cross-section and multiply that number by the length. The cross-section of this prism is a trapezium, and the formula for this is \frac{a+b}{2}h. 
Insert your given numbers to find out the area of this prism's cross-section:
\frac{3+12}{2}12=90
Now, multiply 90 by the length, 10cm, to find out the volume of the prism;
90×10=900cm³
Therefore, your answer id the third option.

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