Triangles

In the figure given below,if DE is parallel to BC,then x equals

• 4cm

• 6.7cm

If in triangles ABC and DF AB/DE=BC/FD,then they will be similar when:

• Angle B=Angle E

• Angle B=Angle D

In triangles ABC and DEF angle A=angle E=40 degree AB:ED=AC:EF and angle F=65 degree Then angle B=

• 65 degree

• 75 degree

The length of an altitude of an equilateral triangle of side a is:

• root 3a/2

• root 3/2a

Two circles with different radii are always _____

• Congruent

• Similar

The line segments joining the mid points of the adjacent sides of a quardilateral form a _____

• Rhombus

• Parallelogram

In triangle ABC,DE is parallel to BC D is midpoint of the AB then AE=

• EC

• DE

If triangle ABC is similar to triangle PQR AB=3.6cm PQ=2.4cm AC=8.1 cm then PR=

• 5.4 cm

• 7.8 cm

Which of the following are always similar?

• Quadrilaterals

• Squares

In triangle ABC if DE is parallel to BC AD=6cm BD=9cm and AE=8cm then AC=

• 12 cm

• 20 cm