PL HL M the orthocenter of a triangle may lie outside the triangle since the may not intersent any side of the triangle

Are you asking for 6 or 15?

The writing is like bold so i can’t see it well

Volume is length times width times height so
20 times 8 times 30 which is 4,800
surface area is ph (p is perimeter of base), h is height.
so perimeter would be length+length+width+width so 20+20+8+8 which is 56. so multiply 56 times 30 which is 1680. hope this !