Question
The figures are not drawn to scale. Figure 1 shows a rectangular piece of paper ZBCE that measures 18 cm by 12 cm. ZA = DC = 6 cm. The paper is folded along the dotted line AD such that point B touches point E, as shown in Figure 2.
  1. Find the area of Figure 2. ZADCE, after the folding. 
  2. In Figure 2, ∠ZAE is 72°. Find ∠ADC in Figure 2.
4 m
(a)

Click button first when a symbol is required. X

(b)

Click button first when a symbol is required. X

The figures are not drawn to scale. Figure 1 shows a rectangular piece of paper ZBCE that measures 18 cm by 12 cm. ZA = DC = 6 cm. The paper is folded along the dotted line AD such that point B touches point E, as shown in Figure 2.
  1. Find the area of Figure 2. ZADCE, after the folding. 
  2. In Figure 2, ∠ZAE is 72°. Find ∠ADC in Figure 2.