Equation of plane π1 is 1(x−3)+2(y+7)−2(z−5)=0 x+2y−2z−3+14+10=0 x+2y−2z+21=0‌‌...‌ (i) ‌ Equation of plane π2 is 3(x−2)+2(y−7)+6(z+8)=0 3x+2y+6z−6−14+48=0 3x+2y+6z+28=0‌‌...‌ (ii) ‌ P1=‌
21
√1+4+4
=7‌ units ‌ P2=‌
28
√9+4+36
=4‌ units ‌ P1−P2=(7−4)‌ units ‌=3‌ units ‌