∙ {\displaystyle \bullet } - נתון
סימונים :
∠ C = 90 ∘ ∙ ∠ A = 56 ∘ ∙ ↓ ( 180 ∘ i n △ ) ∠ B = 90 ∘ − 56 ∘ = 34 ∘ A C = 10 c m B D = D C = x ↓ tan 34 ∘ = 10 2 x ↓ D C = B D = x = 7.413 {\displaystyle {\begin{aligned}\angle {C}=90^{\circ }\bullet \\\angle {A}=56^{\circ }\bullet \\&\downarrow \\(180^{\circ }in\triangle )\angle B=90^{\circ }-56^{\circ }=34^{\circ }\\AC=10_{cm}\\BD=DC=x\\\downarrow \\\tan {34^{\circ }}={\frac {10}{2x}}\\\downarrow \\DC=BD=x=7.413\\\end{aligned}}}
∠ A = 28 ∘ ∙ ∠ C = 90 ∘ ∙ ↓ ∠ E = 90 ∘ − 28 ∘ = 62 ∘ A C = 10 c m ∙ tan 62 ∘ = 10 E C E C = 5.317 ↓ D E = 7.413 − 5.317 = 2.09 {\displaystyle {\begin{aligned}\angle A=28^{\circ }\bullet \\\angle C=90^{\circ }\bullet \\\downarrow \\\angle E=90^{\circ }-28^{\circ }=62^{\circ }\\AC=10_{cm}\bullet \\\tan 62^{\circ }={\frac {10}{EC}}\\EC=5.317\\\downarrow \\DE=7.413-5.317=2.09\\\end{aligned}}}
