Question

please answer all the six question

Answer 1

6. m < ABC + m < CAB + m < ACB = 180° ( sum of all sides of triangle are 180°)
48 + 73 + m < ACB = 180
121 + m < ACB = 180
m<ACB = 180 - 121
M< ACB = 59°

m < ACB + m < ACD = 180° ( angles in linear pair)
59 + m < ACD =180
m < ACD = 180 - 59
m< ACD = 121°

Hope it helps u

Answer 2

sin²B + cos²B = 1
(½)² + cos²B = 1
cos²B= 1 - ¼
cos²B= 4 - ¼
cos²B= ¾
cosB = √3/2

Every square is a rectangle as each angle is 90° but ever rectangle is not a square as all side of a rectangle are not congruent.