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
C.
Area of isosceles triangle
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