What is the third angle for the triangle where angle1 = 45° and angle2 = 45°?

If a triangle has an angle of 90 degrees, what is it called?

In ABC, DE || AB. If CD = 3 cm, EC = 4 cm, BE = 6 cm, then DA is equal to?

In a rectangle Length = 8 cm, Breadth = 6 cm. Then its diagonal = …?

In a square of side 10 cm, its diagonal = ?