Vector Theorem 10: Prove that the angle in semi-circle is a right angle.

Vector Theorem 10: Prove that the angle in semi-circle is a right angle. Vector Theorem 9: The position vectors of the vertices A, B and C of the ∆ABC are a ⃗,b ⃗ and c ⃗ resp. Prove that the position vector of its centroid is g ⃗=1⁄3 (a ⃗+b ⃗+c ⃗ ): https://youtu.be/AEftDrr-GIE

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