The vertex where the two triangles touch forms a pair of vertical angles, so that the angles on opposites sides of the vertex are congruent. You're shown that two legs of both triangles are congruent. All this tells you that the two triangles are isosceles, and furthermore that they are similar because of the congruence of their "base" angles.
This means




Answer is :
cos⁻¹[(-1-4√7)/(√17, √8) = 173.33° ≈ 173°
306+122=428
Because you add 6 & 2 in the ones place which is 8.
then 2 and 0 which is 2.
finally 1 and 3 which is 4
3/5×1/3=1/5×1/1=1/5 so 1/5 is you answer
Answer:
the statements are not written here .