The perimeter and area of each of the given figures are as calculated below.
How to find perimeter and area?
65) Perimeter of a triangle = Sum of all 3 sides
Thus, perimeter = 5cm + 12cm + 13cm = 20 cm
Area of triangle = (1/2) * base * height
Area = (1/2) * 12 * 5 = 30 cm²
66) Length of smaller side of triangle is;
s = √(5² - 3.5²)
s = 3.57
Perimeter = 2(8 + 5)
Perimeter = 26 in
Area = 2[(1/2) * 3.57 * 3.5] + (8 * 3.5)
Area = 12.495 + 28
Area = 40.495 in²
67) Perimeter = 4 * 3¹/₂
Perimeter = 14 in
Area = 3¹/₂ * 3¹/₂
Area = 49/4 in²
68) Perimeter = 3.5 + 7 + 8 + 4
Perimeter = 22.5 ft
Area = ¹/₂(7 * 0.5) + (7 * 3.5)
Area = 26.25 ft²
69) Perimeter of square - 45 cm
Thus;
Side length = 45/4 = 11.25 cm
Area = 11.25 * 11.25 = 126.5625 cm²
70) Volume = 2 * 2¹/₈ * 6³/₄
Volume = 918/32 = 459/16 mm²
Thus, the area, perimeter and volume for each of the figures are respectively;
65) Perimeter = 20 cm
Area = 30 cm²
66) Perimeter = 26 in
Area = 40.495 in²
67) Perimeter = 14 in
Area = 49/4 in²
68) Perimeter = 22.5 ft
Area = 26.25 ft²
69) Area = 126.5625 cm²
70) Volume = 918/32 = 459/16 mm²
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