4.20: t V A rectangle has a perimeter of 28 cm and an area of 48 cm . Find the dimensions of the rectangle, Type your solution, notes and/or work here. Show Solution 4.21: t V If the height of a triangle is multiplied by 4, what must we do to the base of the triangle in order to leave the area unchanged? Type your solution, notes and/or work here. Show Solution 4.22: t V The altitude from A to BC in A ABC has the same length as the altitude from B to AC. Prove that BC = AC. Type your solution, notes and/or work here. Show Solution