On page 8, there is a right angle. All right angles are equal. B D D 9㎝ 10㎝？ And 15 "? Page 9 10 10 28 30 "? The coordinates on page 10 of D B A are (2, twice the root number 3) 18cm 4 has three equal right angles, four parallel sides and two groups of opposite sides. The quadrilateral with the same moment is a parallelogram, and the right-angled parallelogram is a rectangle D, page 1 1, page 12, page AC. =BD BC=2AB Page 13 parallelogram right angles are equal to 1, 3,5, d c101209cad = bcpage14page15. The links in the senior high school entrance examination are five right angles equal and equal. And equal to 90 c 15 radical number 2 10cm page 16 c 15 quarter page 17 test link 6.