Using vectors, prove that angle in a semicircle is a right angle.

Using vector method, prove that the angel in a semi circle is a right angle.

Prove that an angle inscribed in a semi-circle is a right angle using vector method.

Prove that an angle inscribed in a semi-circle is a right angle using vector method.

Show that each angle of a rectangle is a right angle.

Prove that the angle in a segment greater than a semi-circle is less than a right angle.

Prove that the angle in a segment greater than a semi-circle is less than a right angle.

Prove that the angle in a segment greater than a semi-circle is less than a right angle.

Each of the four angles of a rectangle is a right angle.

If the bisectors of the base angles of a triangle enclose an angle of 135^0, prove that the triangle is a right triangle.

If the bisectors of the base angles of a triangle enclose an angle of 135^0, prove that the triangle is a right triangle.