9:08Prove a quadrilateral with opposite angles supplementary is cyclicIan Bailey-Mortimer59 views·9 months ago
5:46Prove a line perpendicular to the radius at the circumference is a tangentIan Bailey-Mortimer23 views·9 months ago
6:34Prove a tangent is perpendicular to the radius at the point of contactIan Bailey-Mortimer81 views·9 months ago
5:18Prove opposite angles of a cyclic quadrilateral are supplementaryIan Bailey-Mortimer137 views·9 months ago
7:20Prove the angle at the centre is twice the angle at the circumferenceIan Bailey-Mortimer13 views·9 months ago
4:37Prove a radius perpendicular to a chord bisects the chordIan Bailey-Mortimer33 views·9 months ago
8:26Vector proof 3 Sum of squares of lengths of parallelogramIan Bailey-Mortimer29 views·9 months ago
10:30Integration by substitution 44 Definite integrals with changing limitsIan Bailey-Mortimer21 views·11 months ago
