Perimeter and Area - ICSE STD 7 MATHS Questions

Area of a rectangle and the area of a circle are equal. If the dimensions of the rectangle are $14 \ cm \times 11 \ cm,$ then the radius of the circle is

A
$21 \ cm$
B
$14 \ cm$
C
$10.5 \ cm$
✓
$7 \ cm$

Answer: D.

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Q 12MCQ1 Mark

The perimeter of a semicircle $($including its diameter$)$ of radius $7 \ cm$ is

A
$22 \ cm$
B
$29 \ cm$
✓
$36 \ cm$
D
$44 \ cm$

Answer: C.

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Q 13MCQ1 Mark

If the ratio of the radii of two circles is $3: 5$, then the ratio of their areas is

A
$3: 5$
B
$5: 3$
C
$25: 9$
✓
$9: 25$

Answer: D.

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Q 14MCQ1 Mark

If the ratio of the radii of two circles is $2$ then the ratio of their circumferences is

✓
$2: 3$
B
$3: 2$
C
$4: 9$
D
$9: 4$

Answer: A.

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Q 15MCQ1 Mark

The area of a circle of diameter $d$ is

A
$2 \pi d^2$
B
$\pi d^2$
C
$\frac{\pi d^2}{2}$
D
$\frac{\pi d^2}{4}$

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