Step 1 : Draw a circle with radius 3 cm and centre O.
Step 2 : Draw any diameter AOB and Draw a radius OC such
such that BOC = 60°.
Step 3 : At C draw a perpendicular with OC and at A also
draw a perpendicular with OA.
First we draw a right angle triangle
Step 1 : Draw a side AB of 4 cm with the help of scale.
Step 2 : Draw an perpendicular at point A with the help of compass. And cut 3 cm on it and named it as C.
Now we draw a triangle similar to right triangle whose sides are 3/5 times the corresponding sides.
Step 1 : Draw a line from point A below the AB.
Step 2 : Cut the line AD in 5 equal parts from point A and name them A1, A2, A3, A4, A5
Step 3 : Meet the point A5 with B and make parallel to A5B from A3.
Step 4 : Make a line parallel to BC from B1.
So, ∆ AB1C1 the required triangle whose corresponding side
is 3/5 of the right angle triangle.
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