Question 11

If ABCD is a square and BCE is an equilateral triangle, what is the measure of ∠DEC?

Name: If ABCD is a square and BCE is an equilateral triangle, what is the measure of ∠DEC?
Uploaded: Sept. 28, 2021, 10:20 a.m.
Duration: 1 min 21 s
Description: If ABCD is a square and BCE is an equilateral triangle, what is the measure of ∠DEC?

Solution

According to given diagram, as triangle BCE is equilateral CE=BE=DC
Hence angle CDE = angle CED

So angle DEC = $$\frac{180-150}{2} = 15$$

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If ABCD is a square and BCE is an equilateral triangle, what is the measure of ∠DEC?

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