Mathematics

= 60

900/45

Polygon Formulas

(N = # of sides and S = length from center to a corner)

Area of a regular polygon = (1/2) N sin(360°/N) S2

Sum of the interior angles of a polygon = (N - 2) x 180°

perimeter = 2( 9 inches + 1 foot)

= 2( 3/4 foot + 1 foot )

= 2(1 3/4 feet)

= 3 1/2 feet

Examples #1:

25 % of 200 is____

In this problem, of = 200, is = ?, and % = 25

So, 25 % of 200 is 50

Since 1 × 100 = 100, y = 1

If I say 25 % of___ is 60, we know that the whole is missing and part = 60

900/45 = 20, so x = 20

#388

1852 – 1,5 20 cm · 30 cm

Problem text: 1852 – 1,5 20 cm · 30 cm. It should b read as: 1852 minus 1,5 20 cm gange 30 cm