Areas of two similar triangles are 36 cm² and 100 cm². If the length of a side of the larger triangle is 20 cm, then the length of the corresponding side of the similar triangle is:

In a quadrilateral ABCD, E is a point in the interior of the quadrilateral such that DE and CE are the bisectors of ∠D and ∠C, respectively. If ∠B = 82° and ∠DEC = 80°, then ∠A = ?

If the circumradius of an equilateral triangle be 10 cm, then the measure of its in-radius is

On increasing the radius of circle by 1 cm, its area is increased by 44 cm² .The original radius of the circle is -

Which of the following biomes does not have a tree?

In a triangle, if orthocentre, circumcentre, incentre and centroid coincide, then the triangle must be

PK is the median and M is a centroid of triangle PQR. If PK is 15 cm, then find length of PM?

AC is a chord of circle whose centre is at O. If B is any point on the arc AC and ∠OCA=20⁰ , then the magnitude of ∠ABC is