Geometry

A triangle with angles 40, 40, and 100 degrees is:

The perpendicular drawn from a vertex to the opposite side is called the:

Which of these is NOT a criterion for congruence of triangles?

If all sides of a triangle are equal to 5 cm, its perimeter is:

In triangle ABC, if angle A = 90 degrees, which side is the hypotenuse?

An exterior angle of a triangle is 110 degrees and one of the interior opposite angles is 40. Find the other interior opposite angle.

A triangle having two sides equal is called:

What is the sum of the exterior angles of a triangle (one at each vertex)?

The ratio of the angles of a triangle is 1:2:3. What is the largest angle?

In a right-angled triangle, if one acute angle is 35 degrees, what is the other?

The point of intersection of the altitudes of a triangle is called:

A triangle can have how many right angles?

In triangle PQR, if PQ = PR, which angles are equal?

Calculate the area of a triangle whose sides are 13 cm, 14 cm, and 15 cm using Heron's formula.

Two triangles are similar if their corresponding sides are:

If the areas of two similar triangles are in the ratio 16:25, what is the ratio of their corresponding sides?

In triangle ABC, D and E are points on AB and AC respectively such that DE is parallel to BC. If AD=2, DB=3, and AE=4, find EC.

The centroid of a triangle divides each median in the ratio:

What is the length of the altitude of an equilateral triangle with side 'a'?

Find the area of an equilateral triangle with side 6 cm.