Question

solve 14 and 15.............​

Answer 1

Answer:

The answer for number 15 is 40°

Step-by-step explanation:

1- AB and AC are equal, therefore the triangle is an isosceles triangle.

2- In an isosceles triangle the two equal sides have the same equal angle, i.e <B= 50° therefore <C= 50°.

3- Every triangle has a total of 180°, i.e <A+<B+<C= 180°. We already know <B and <C so now we can find angle A.

<A+50+50=180

<A+100=180

<A=180-100

<A=80°

4- AD is median, that means angle A is divided into 2 equal parts. There <BAD=<A/2

<BAD=80/2

<BAD= 40°

Answer 2

Answer:

14). <4=(160-3y)° ;<5=(3y+20)°

Step-by-step explanation:

GIVEN: <1=(2x+y)°,<2=(x+2y)°,<3=(3y+20)°

<3=<5=(3y+20)° [vertically opposite <s]

& <3+<4=180° [by linear pair]

→3y+20°+<4=180°

→<4=180°-3y-20°

→<4=160°-3y