Area and Perimeter
- The area of a right angled triangle is 40 sq cm. If its base is equal to 28 cm. find its height.
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Given that,
area = 40 sq cm,
base = 28 cm and
height = perpendicular = ?
Area = (base x perpendicular) / 2Correct Option: C
Given that,
area = 40 sq cm,
base = 28 cm and
height = perpendicular = ?
Area = (base x perpendicular) / 2
⇒ 40 = (28 x perpendicular) / 2
∴ perpendicular = 40/14 = 20/7
= 26/7 cm
- The area of a right angled triangle is 10 sq cm. If its perpendicular is equal to 20 cm, find its base.
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Given that, area = 10 sq cm,
perpendicular = 20 cm and base = ?
area = (base x perpendicular) / 2Correct Option: A
Given that, area = 10 sq cm,
perpendicular = 20 cm and base = ?
area = (base x Perpendicular) / 2
⇒ 10 = (base x 20) / 2
∴ base = 1 cm
- What is the diameter of the circle having 3 cm radius?
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Radius = Diameter/2
∴ Diameter = 2 x RadiusCorrect Option: A
Radius = Diameter/2
∴ Diameter = 2 x Radius
= 2 x 3
= 6 cm
- If the sides of a rectangle are increased by 10% find the percentage increased in its diagonals.
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According to the formula,
∵ Percentage increase in sides = 10%
∴ Percentage increase diagonals = 10%Correct Option: B
According to the formula,
∵ Percentage increase in sides = 10%
∴ Percentage increase diagonals = 10%
- If the sides of a rectangle are increased by 5%, find the percentage increase in its diagonals.
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According to the formula,
Percentage increase in diagonals = 5%Correct Option: C
According to the formula,
Percentage increase in diagonals = 5%