Construct a triangle ABC with side $BC=7\ cm$, $\angle B = 45^{o}$, $\angle A = 105^{o}$. Then construct another triangle whose sides are $\frac{3}{4}$ times the corresponding sides of the ABC.
Given: Side $BC=7\ cm$, $\angle B = 45^{o}$, $\angle A = 105^{o}$.
To do: To Construct a triangle ABC with side $BC=7\ cm,\ \angle B = 45^{o}$, $\angle A = 105^{o}$ and then construct another triangle whose sides are $\frac{3}{4}$times the corresponding sides of the ABC.
Solution:
Here $BC=7\ cm$, $\angle B =45^{o}$ , $\angle A=105^{o}$
Draw $BC=7cm$ With help of a ruler
Take a protractor measure $\angle45^{o}$
From point B and draw a ray BX.
From point mark $30^{o}$ with help of protractor & draw a ray CY.
Now both BX and BY intersect at a point and this point is A Now we have ABC
To construct similar triangle with corresponding sides of the sides.
Step 1: Draw a ray BZ making an acute angle with BC.
Step 2: Along the ray BZ mark four points $B_{1} ,\ B_{2} ,\ B_{3}$ and $B_{4}$ such that $BB_{1} =B_{1} B_{2} =B_{2} B_{3} =B_{3} B_{4}$.
Step 3: Now join $B_{4}$ to C and draw a line parallel to $B_{4} C from $B_{3}$ intersecting the line BC at C'.
Step 4: Draw a line through C' parallel to CA which intersects AB at A'.