Q1 of 100 Page 17

In Fig. 16.176, Δ ABC is an equilateral triangle. Find m∠BEC.

Since,

Triangle ABC is an equilateral triangle


∠BAC = 60o


∠BAC + ∠BEC = 180o (Opposite angles of quadrilateral)


60o + ∠BEC = 180o


∠BEC = 120o


More from this chapter

All 100 →
10

In Fig. 16.139, if ∠ACB=40°, ∠DPB=120°, find ∠CBD.

 11

A chord of a circle is equal to the radius of the circle. Find the angle substended by the chords at a point on the minor arc and also at a point on the major arc.

 2

In Fig. 16.177, Δ PQR is an isosceles triangle with PQ=PR and m∠PQR=35°. Find m∠QSR and m∠QTR.

 3

In Fig. 16.178, O is the centre of the circle. If ∠BOD=160°, find the values of x and y.