Canfod hyd yr hypotenws

Question

Canfydda hyd \({BR}\) yn gywir i \({1}\) lle degol.

Diagram diamedr a radiws cylch

\[{BR}^{2} = {4}^{2} + {7}^{2}\]

\[{BR}^{2} = {16} + {49}\]

Canfydda ail isradd y ddwy ochr

\[{BR}^{2} = {65}\]

\({BR} = {8.1}~cm\) (i \({1}\) ll. d.).