On a common hypotenuse AB, two right triangles ACB and ADB are situated on opposite sides. Prove that BAC = BDC.
Given that on a common hypotenuse AB, two right triangles ACB and ADB are situated on opposite sides.
Let ACB and ADB are two right-angled triangles with common hypotenuse AB.
To prove: BAC = BDC
Proof:
Let O be the mid-point of AB
Then, OA = OB = OC = OD
Mid-point of the hypotenuse of a right triangle is equidistant from both vertices.
We can draw a circle passing through the points A, B, C and D with O as centre and radius equal to OA.
We know that angles in the same segment of a circle are equal
From the figure, BAC and BDC are angles of same segment BC.
BAC = BDC
Hence proved.