Find a pyrometer and the area of a rectangle if the length of one of its sides is 18 cm and the other

Find a pyrometer and the area of a rectangle if the length of one of its sides is 18 cm and the other: 1) 2 times more 2) 3 times more

Given:

a = 18 cm;

1) b is 2 times more;

2) b is 3 times more;

P =? (cm) ;

S =? (cm²).

The perimeter of the rectangle is calculated using the formula: P = (a + b) * 2.
The area of the rectangle is calculated by the formula S = a * b.

1) If b is 2 times larger, then:
18 * 2 = 36 (cm).
P1 = (18 + 36) * 2 = 108 (cm).
S1 = 18 * 36 = 648 (cm²).
2) If b is 3 times more, then:
18 * 3 = 54 (cm).
P2 = (18 + 54) * 2 = 144 (cm).
S2 = 18 * 54 = 972 (cm²).

Answer: Р1 = 108 cm, S1 = 648 cm², Р2 = 144 cm, S2 = 972 cm².