Question

1. the perimeter of a square with side 7 cm is: *

a. 21 cm
b. 28 cm
c. 14 cm
d. 49 cm

1. a triangle has sides 5 cm, 6 cm, and 7 cm. its perimeter is: *

a. 18 cm
b. 20 cm
c. 16 cm
d. 15 cm

Explanation:

Step1: Recall square perimeter formula

The perimeter $P$ of a square is $P = 4s$, where $s$ is the side - length. Given $s = 7$ cm.
$P=4\times7$

Step2: Calculate the perimeter

$4\times7 = 28$ cm

Step1: Recall triangle perimeter formula

The perimeter $P$ of a triangle with side - lengths $a$, $b$, and $c$ is $P=a + b + c$. Given $a = 5$ cm, $b = 6$ cm, and $c = 7$ cm.
$P=5 + 6+7$

Step2: Calculate the perimeter

$5+6 + 7=18$ cm

Answer:

B. 28 cm