角BDC=180-y(opp.angle,cyclic quad) 角 BED =180-x(opp.angle,cyclic quad) In triangle BED , 角B+角E+角D=180(angle sum of triangle) 70+(180-x)+(180-y)=180 x+y=250
...width of the path around be x meters. The sides of the blower- bed are 10-2x and 8-2x meters. (10-2x)(8-2x)/(10*8)= 3/10, (5-x)(4...
...16 cm)² + BE² BE² = 144 cm² BE = 12 cm In Δ BED : BD² = BE² + ED² (Pythagorean theorem) (15 cm...
Assume that the square in the figure is the flower- bed . By Pythagorean theorem, Length of each side of the square...
你係咪打錯左? 因為 ext.∠ of△既關係, ∠CAD無可能=∠ BED 如果你既問題係 In the figure, AED and CDB are straight lines.∠CAD...