Question

All formulas of mensuration related to class8

Answer 1

area of rectangle is equal to length into breadth area of square is equal to side square area of trapezium is equal to area of rhombus is equal to one girl with two diagonal 1 into diagonal to area of triangle is equal to one database into height of 4 is equal to height 1 divide by 2 sum of two parallel sides into height

Answer 2

ʀᴇᴠɪsɪᴏɴ ᴏғ ғᴏʀᴍᴜʟᴀs ᴏғ ᴍᴇɴsᴜʀᴀᴛɪᴏɴ ᴄʜᴀᴘᴛᴇʀ

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♦ CSA of cuboid ➾ 2(bh + hl)

♦ TSA of Cuboid ➾ 2(lb + bh + hl)

♦ Volume of Cuboid ➾ Length × Breadth × Height

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♦ CSA of cube ➾ 4L²

♦ TSA of Cube ➾ 6L²

♦ Volume of Cube ➾ Length³

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♦ CSA of  Right Circular Cylinder ➾ 2πrh

♦ TSA of  Right Circular Cylinder ➾ 2πr(r + h)

♦ Volume of  Right Circular Cylinder ➾ πr²h

♦ CSA of Right Circular Hollow Cylinder ➾ 2πh(r + R)

♦TSA of Right Circular Hollow Cylinder  ➾ 2π(r + R) (h + R – r)

♦  Volume of Right Circular Hollow Cylinder  ➾ πh(R² – r²)

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♦ CSA of Right Circular Cone ➾ πrl

♦ TSA of Right Circular Cone  ➾ πr(r + l)

♦ Volume of Right Circular Cone  ➾ ⅓ (πr²h)

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♦ CSA of Sphere ➾ 4πr²

♦ TSA of Sphere   ➾ 4πr²

♦ Volume of Sphere   ➾ 4/3 (πr²)

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♦ CSA of Hemisphere ➾ 2πr²

♦ TSA of  Hemisphere ➾ 3πr²

♦ Volume of  Hemisphere ➾ 2/3 (πr²)

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♦ CSA of Frustum ➾ πl(r + R)

♦ TSA of  Frustum  ➾ πl(r + R) + p(r² + R²)

♦ Volume of  Frustum  ➾ ⅓πh(r² + R² + rR)