ABC is a right-angled triangle. B being the right angle. Mid-points of BC and AC are respectively B' and A'. The ratio of the area of the quadrilateral AA'B'B to the are of Δ ABC is 

• 1 : 2

• 2 : 3

• 3 : 4

• None of these

In the ΔABC,  and the bisectors of  and  meets at P What is the value (in degrees) of 

• 100°

• 105°

• 115°

• 125°

The two equal sides of an isosceles triangle is 20 cm each and the third side is 30 cm. What is the area (in cm²) of the triangle?

• 

• 100 cm²

• 

• 175 cm²

D and E are points on side AB and AC of Δ ABC. DE is parallel to BC. If AD : BD = 2 : 5 and area of Δ ABC is 98 cm², what is the area (in cm²) of quadrilateral BDEC?

• 90 cm²

• 98 cm²

• 94 cm²

• 86 cm²