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Answer 1

13)

• BC

14)

• $\angle U$

15)

Since, both triangles are congruent, the corresponding angles will be same for both.

• 105°

16)

• 20

Explanation for 16

Since, AB= AC, it's an isosceles triangle,

And, $\angle B = \angle C$

We know that sum of angles of a triangle = 180

Therefore,

$\angle A + \angle B + \angle C = 180 \\\\ \angle A + 80+80 = 180 \\\\ \angle A = 180-160 = 20$

17)

• All are correct

18)

• CPCT

19)

• $\angle R$

Answer 2

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13) BC

14) Ang. U

15) 105 °

• Since both triangles are congruent then there corresponding angles will be equal, i.e ang S = ang A

16) 20°

• ★Since, AB= AC,
• ★Therefore ∠B=∠C (ang opp to equal sides are equal)

• ★We know that sum of angles of a triangle = 180

• ★Therefore,
• ∠A+∠B+∠C=180
• ∠A+80+80=180
• ∠A=180−160=20

17) 3rd option

18)CPCT

19) angle R

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