Answer:
21. P = a + b + c (perimeter of a triangle)
20 = 7 + 7 + c
20 = 14 + c
20 - 14 = c
c = 6cm
22.
= 36 - (5 + 4 + 5 + 4 + 10)
= 36 - (28)
= 8 cm (very obvious from the illustration)
23.
= 67 - (8 + 20 + 10 + 7 + 8 + 9)
= 67 - 62
= 5 cm
24. P = 2 (L + W) (perimeter of a rectangle)
30 = 2 (9 + W)
30 = 18 + 2W
30 - 18 = 2W
12 = 2W
W = 6cm
25.
= 11 - [4 + (2 x 2)]
= 11 - (4 + 4)
= 11 - 8
= 3cm
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Answer:
21. P = a + b + c (perimeter of a triangle)
20 = 7 + 7 + c
20 = 14 + c
20 - 14 = c
c = 6cm
22.
= 36 - (5 + 4 + 5 + 4 + 10)
= 36 - (28)
= 8 cm (very obvious from the illustration)
23.
= 67 - (8 + 20 + 10 + 7 + 8 + 9)
= 67 - 62
= 5 cm
24. P = 2 (L + W) (perimeter of a rectangle)
30 = 2 (9 + W)
30 = 18 + 2W
30 - 18 = 2W
12 = 2W
W = 6cm
25.
= 11 - [4 + (2 x 2)]
= 11 - (4 + 4)
= 11 - 8
= 3cm