First, choose the value of the edge a of the cube ABCDEFGH.
a = ? 2 4 6 8 10 cm
Then complete the following sentences:
In the triangle HEC right-angled at ,
we use the theorem:
EC² = EH ² + HC²
EC² = + HC²
In the triangle DHC right-angled at ,
HC² = HD ² + DC²
HC² = +
HC² =
EC²= + HC²
EC²= +
EC²=