Question

find the value of x
options
(a) 90°
(b) 40°
(c) 210°
(d) 80°​

Answer 1

Answer:

option (C) is correct=(210° answer)

Answer 2

Answer:

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Use the given figure to find the numerical value of angle x in degrees.

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Solution

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Correct option is A)

Let the given triangle be ABC such that ∠ABC=36. A line through C meets AB at D.

Now, In △DBC,

DB=DC (Given)

hence, ∠DBC=∠DCB=36

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(Isosceles triangle property)

Sum of angles of triangle = 180

∠DBC+∠DCB+∠CDB=180

36+36+∠CDB=180

∠CDB=108

Now, ∠ADC=180−∠ADB

∠ADC=180−108

∠ADC=72

∘

in △ADC,

∠ADC=∠DAC=72

∘

(Isosceles triangle property, AC= CD is given)

Sum of angles = 180

∠ADC+∠CAD+∠ACD=180

72+72+x=180

x=180−144

x=36

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