Question

plz answer fast\
Q12. Angles are complementary if the sum of their measures is __________ .
Q13. Give a precise definition of skew lines.
Q14. Suppose that two lines are cut by a transversal.
How many pairs of alternate interior angles are there?
Q15. Factorise: (i) x2 + 5x + 6 (ii) x2 − 12x + 27 (iii) x2 + 6x - 16
Q16. Prove that sum of the angles of a triangle is 180▫.
Q17. Prove that a diagonal of a parallelogram divides it into two congruent triangles.
Q18. Prove that the parallelograms on the same base and between the same parallels are equal in area.
Q19. If D is a point on side BC of ▲ABC such that AD = AC then show that AB > AD.
Q20. Show that if the diagonals of a quadrilateral are equal and bisect each other
at right angles, then it is square

Answer 1

12. 90°
14. 2pair

I am sure for thid