Question

In figure 3.8, ACD is an exterior angle of A ABC.
B = 40°, A= 70°. Find the measure of angleACD.​

Answer 1

Answer:

c=70 degree

Step-by-step explanation:

Formula: Angle sum property of a triangle

= Angle A+B+C=180 Degrees

=Let the third angle be 'x'

=70+40+x=180

=110+x=180

=x=180-110

=x=70 Degree

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Answer 2

Step-by-step explanation:

ΔABC. ∠B =40°,∠A=70°.

the measure of ∠ACD = 110°

Step-by-step explanation:

in a triangle sum of all angles = 180°

∠ABC + ∠BAC + ∠ACB = 180°

=> ∠B + ∠A + ∠ACB = 180°

=> 40° + 70° + ∠ACB = 180°

=> ∠ACB = 70°

∠ACB + ∠ ACD = 180° ( straight line)

=> 70° + ∠ ACD = 180°

=> ∠ ACD = 110°