maths 8 class 4 chaper
Answers
Answer:
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Explanation:
Explanation:
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Here, we will define the geometrical formulas consistently used in Mathematics Class 8. We will use the following abbreviations for convenience:
1. LSA – Lateral/Curved Surface Area
2. TSA – Total Surface Area
Name of the Solid Figure Formulas
Cuboid
LSA: 2h(l + b)
TSA: 2(lb + bh + hl)
Volume: l × b × h
l = length,
b = breadth,
h = height
Cube
LSA: 4a2
TSA: 6a2
Volume: a3
a = sides of a cube
Right Pyramid
LSA: ½ × p × l
TSA: LSA + Area of the base
Volume: ⅓ × Area of the base × h
p = perimeter of the base,
l = slant height, h = height
Right Circular Cylinder
LSA: 2(π × r × h)
TSA: 2πr (r + h)
Volume: π × r2 × h
r = radius,
h = height
Right Circular Cone
LSA: πrl
TSA: π × r × (r + l)
Volume: ⅓ × (πr2h)
r = radius,
l = slant height,
h = height
Right Prism
LSA: p × h
TSA: LSA × 2B
Volume: B × h
p = perimeter of the base,
B = area of base, h = height
Sphere
LSA: 4 × π × r2
TSA: 4 × π × r2
Volume: 4/3 × (πr3)
r = radius
Hemisphere
LSA: 2 × π × r2
TSA: 3 × π × r2
Volume: ⅔ × (πr3)
r = radius