1.
P= l × 4
l = 6 cm
P = 6×4 = 24 cm
3.
P = 24
l = P : 4
l = 24 : 4
l = 6 cm
4.
P = l × 4
l = 0.25
P = 0.25 × 4
P = 1 cm
5.
a. P = L × 2 + l × 2
L= 16 cm
l= 4 cm
P = 16 × 2 + 4 × 2
P = 32 + 8
P = 40 cm
b. A = L × l
L = 16 cm
l = 4 cm
A = 16 × 4
A = 64 cm
6.
L = 27 cm
l = 27 - 8 cm
l = 19 cm
a. P = L × 2 + l × 2
P = 27 × 2 + 19 × 2
P = 54 + 38
P = 92 cm
b. A = L × l
A = 27 × 19
A = 513 cm
7.
a. P = l × 4
l = 8 cm
P = 32 cm
b. A = l²
l = 8 cm
A = 8² = 64 cm
8. P = l × 4
P = 28 cm
l = P : 4
l = 28 : 4
l = 7 cm
9.
a. P = l × 4
l = 7 dm
P = 7 × 4
P = 28 cm
b. A = l²
l = 7 dm
A = 7²
A = 49 dm