Page 19 - How To Solve Word Problems In Calculus

The perimeter of a triangle is the sum of the lengths of its 3
sides. The perimeter of an equilateral triangle of side s is simply
3s.

b
h

b a
1
1 A = ab
A = bh
2 2

S S b
θ
S a
1
A = √3 s 2 A = ab sin θ
2
4
A circle is measured by its radius r. The perimeter of a
circle is known as its circumference. Occasionally the diameter
d
d will be given in place of the radius. Since r = , the area and
2
circumference may also be expressed in terms of d.

C = 2πr = πd
πd 2
2
A = πr =
4

r

C = 2π = πd
r
A =πr = πd 2
2
4
6