Question
A boy goes to school with a speed of 75 km/h and comes
back with a speed of 45 km/h. find his average speed?Solution
Since the distance travelled by a boy (going to school and coming back from school) is equal. So, average speed = 2xy/(x + y) Average speed = (2 x 75 x 45)/(75 + 45) Average speed = (2 x 75 x 45)/120 = 56.25 km/hr
In the figure BD = CD = AC, ∠ABC = 27 ° , ∠ACD = y. Find value of x.
In an obtuse angle  triangle PQR, the external angle bisector of angle P intersect the extended part of line RQ at M and the external angle bisector...
The lengths of three medians in a triangles are 9 cm, 12 cm, 15 cm. What is the area of that traingle (in cm 2 )?
If G is the centroid and AD, BE, CF are three medians of ∆ABC with area 54 cm 2 , then the area of ∆BGD is?
The length of the each side of an equilateral triangle is 14√3. The area of incircle, (cm 2 ) is
The perimeter of a rectangle is 48 cm, and the ratio of its length to breadth is 3:5. What is the area of the rectangle?
Find area of a sector of radius 14 cm with central angle 90°. (π = 22/7)
From an external point P, two tangents PR and PS are drawn to a circle with a radius of 10 cm. If the length of each tangent is 14 cm, determine the per...
If in a ΔABC, D is a point on BC such that BD = 1cm , BC = 3 cm then what is ratio of area of ΔABD to area of ΔADC ?
Relevant for Exams:
