Mathematics
BEC is an equilateral triangle inside the square ABCD. The value of angle ECD is :
60°
30°
75°
45°
Rectilinear Figures
3 Likes
Answer
Given,
BEC is an equilateral triangle.
∴ ∠BCE = 60°.
From figure,
⇒ ∠ECD = ∠BCD - ∠BCE = 90° - 60° = 30°.
Hence, Option 2 is the correct option.
Answered By
1 Like
Related Questions
If three angles of a quadrilateral are equal to 90° each, then the quadrilateral is :
rectangle
square
parallelogram
rhombus
E is the mid-point of side AB and F is the mid point of side DC of parallelogram ABCD. Prove that AEFD is a parallelogram.
The diagonal BD of a parallelogram ABCD bisects angles B and D. Prove that ABCD is a rhombus.
If three angles of a quadrilateral are equal, then the quadrilateral is :
rectangle
rhombus
not a parallelogram
parallelogram