Question
A boy goes to school with a speed of 85 km/h and comes
back with a speed of 40 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 85 x 40)/(85 + 40) Average speed = (2 x 85 x 40)/125 = 54.4 km/hr
- A triangle has a base of 22 cm and the corresponding height is 9.5 cm. Calculate its area.
Calculate the hypotenuse of an isosceles right-angled triangle where the equal sides are 8√6 cm each.
What is the height of an equilateral triangle if each of its sides is 4√3 cm?
What is the height of an equilateral triangle if each side measures 8√3 cm?
In a ΔDEF, ∠D = 45°, ∠E = 2∠F. What is the value of ∠F?
If the ratio of the area of two similar triangles is √3:√2 then what is the ratio of the corresponding sides of the two triangles?
In a right-angled triangle, the legs are in the ratio 3:4, and the hypotenuse is 25 cm. Find the perimeter of the triangle.
If the side of an equilateral triangle is 12cm, then find the area (in cm 2 ) of the triangle (correct to two decimal places).
The corresponding medians of two similar triangles are 12 cm and 15 cm. If the area of the first triangle is 288 cm, then find the area of the second tr...
An equilateral triangle ABC is surmounted on a square BCDE whose area is 500 cm². Find the altitude of triangle ABC.
