Solids formulas

Question 1

Volume of a prism

Answer 1

V= area of cross section x length

Question 2

Surface Area of a prism

Answer 2

S.A= add up the area of all the faces

Question 3

Volume of trapezium

Answer 3

V=1/2 (a+b) x height x length

a+b= parallel sides of the trapezium

Question 4

Volume of cylinder

Answer 4

V= πr(sq)h

Question 5

Surface Area of cylindert

Answer 5

S.A= 2πr(sq) + 2πrh

Question 6

Volume of pyramid

Answer 6

1/3 x area of base x perpendicular height

Question 7

Arc of a cone

Answer 7

Arc= xº/360º x πd

Question 8

Circumference of a base

Answer 8

C= 2πr or C=πd

Question 9

Curved area of a cone

sector

Answer 9

xº/360º πr(sq)

Question 10

Surface area of a cone

Answer 10

S.A= πrl + πr(sq)

Question 11

pytagoras

Answer 11

a(sq) + b(sq) = c(sq)

Question 12

How do you find the slant length of a cone?

Answer 12

l(sq)= h(sq) + r(sq)

l=slant length h= perpendicular height r= radius

Question 13

Volume of a cone

Answer 13

1/3 πr(sq)h

Question 14

Surface Area of a sphere & of a hemisphere

Answer 14

4πr(sq)

hemisphere the same but divided by 2

Question 15

Volume of a Sphere & of a hemisphere

Answer 15

4/3 πr(cubed)

hemisphere the same but divided by 2

Question 16

Area of a triangle (not right angles triangle)

Answer 16

1/2 abSinC

a+b= the “arms” of angle C