Question

formulas mensuration
of maths for class 8th

Answer 1

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Answer 2

hello frnd!

here's ur answer...

first formulas for all 2d shapes:-

shape perimeter area

1.square side×4 side²

2.rectangle 2(l+b) l×b

3.circle 2πr. πr²

4.trapezium +of all all sides 1/2×h(b1+b2)

5.triangle. +of all sides. 1/2×b×h

6.rhombus. side×4. 1/2×d1×d2,b×h

7.parallelogram 2(l+b). b×h

now CSA , TSA and CSA+1base of 3d shapes.

shape CSA TSA CSA+1b

1.cube. 4a². 6a². 5a²

2.cuboid. 2h(l+b). 2(lb+bh+lh). 2h(l+b)+lb

3.cylinder. 2πrh. 2πr(h+r). 2πr(h+r)+πr²

volumes

1. cube=side³

2.cuboid=l×b×h

3.cylinder=πr²h

these all r the formula for class 8th ch mensuration.

hope this helps...