Question

Giúp e câu 3 đi ạ

Answer 1

\(d\left(M;\left(ABCD\right)\right)=\dfrac{1}{2}d\left(S;\left(ABCD\right)\right)=\dfrac{a}{2}\)

Answer 2

Theo định lý Talet ta luôn có: 

\(\dfrac{MK}{SH}=\dfrac{AM}{SA}=\dfrac{1}{2}\Rightarrow MK=\dfrac{1}{2}SH\)

Hay \(d\left(M;\left(ABCD\right)\right)=\dfrac{1}{2}d\left(S;\left(ABCD\right)\right)\)