Question

Find the volume of prism. If its base area is 30 cm' and height is 5cm​

Answer 1

Step-by-step explanation:

REF.image

Sol:

Vol. of △ ular prism =

Area of △ ular base × height.

∴ Area of triangular base =

area of triangle PQR

By heron's formula.

S=

S(s−a)(s−b)(s−c)

where S=

2

a+b+c

∴Areaof△PQR=

S=

2

3+4+5

=6

S=

6(6−3)(6−4)(6−5)

=

3×2×3×2×1

=6cm

2

∴ vol. of Prism =6×10

=60cm

3

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