Question
In a college the ratio of boys and girls are in the
ratio 3:4. 40% girls and 20% boys were absent. Find the girls present if the total number of students in a college were 210.Solution
Boy : Girl = 3:4 Total number of students = 210 Number of Boys = (3/7) × 210 = 90 Number of Girls = (4/7) × 210 = 120 Number of girls absent = 40% × 120 = 48 Number of boys absent = 20% × 90 = 18 Total number of girls present = 120 – 48 = 72
One chord of a circle is given as 18.5 cm. Then the radius (r) of the circle must be:
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Sum of diameter and circumference of a circle is 232 cm, the find area of circle.
Find the area of the sector of a circle with radius 14 cm and central angle 90°.
The area of a sector of a circle is 88cm² and the angle of the sector is 60º. Find the radius of the circle.
From an external point P, two tangents PA and PB are drawn to a circle with center O. If OP = 13 cm and the radius of the circle is 5 cm, find the lengt...
- A square has an area of 2,500 cm². Find the area of a circle whose radius is (2/5)ᵗʰ of the length of the square’s side. (Take π = 3.14)
In a circle, two chords AB & CD are produced at P which is outside the circle . If PA= 12 cm, AB= 10 cm , PC = 2 cm then find CD.
Two circles of radii 15 cm and 10 cm touch each other externally at a point A. PQ is the direct common tangent of those two circles of centers O ₁ and...
- Calculate the area of a circle whose radius is (7/8)ᵗʰ of the side of a square whose area measures 1,600 cm². (Take π = 3.14)
