Q. Construct an angle of ${90}^{\circ }$ at the initial point of a given ray and justify the construction.

Q. Construct an equilateral triangle, given its side $=3$ and justify the construction.

Q. Construct an angle of ${45}^{\circ }$ from a horizontal line and justify the construction.

Q.

Construct the angles of the following measurements:
(i) ${30}^{\circ }$
(ii)${22\frac{1}{2}}^{\circ }$
(iii) ${15}^{\circ }$

Q. Construct a triangle $XYZ$ in which $\angle Y={30}^o$, $\angle Z={90}^o$ and $XY+ZX+YZ=11cm$.

Q. Construct a triangle $PQR$ in which $QR=6cm$, $\angle Q={60}^o$ and $PQ-PO=2cm$.

Q. Construct a triangle $ABC$ in which $BC=7cm$, $\angle B={75}^o$ and $AB+AD=13cm$.

Q. Construct a right-angled triangle whose base is $12cm$ and the sum of its hypotenuse and another side is $18cm$.