Odpowiedź:
1.
[tex]h = \frac{a \sqrt{3} }{2} \\ \\ 1 0\sqrt{3} = \frac{a \sqrt{3} }{2} \\ a = 10 \sqrt{3} \times \frac{2}{ \sqrt{3} } = 20 cm[/tex]
[tex]Ob = 3a = 60 cm \\ \\ P = \frac{ {a}^{2} \sqrt{3} }{4} = \frac{ {20}^{2} \sqrt{3} }{4} = 100 \sqrt{3} {cm}^{2} [/tex]
2.
a-dłuższa podstawa = 8 cm
b-krotsza podstawa= 4 cm
c-ramię= 4 cm
3.
D=10
2a=10
a=5
[tex]Ob = 6a = 6 \times 5 = 30 \: cm \\ \\ P = 6 \times \frac{ {a}^{2} \sqrt{3} }{4} = \frac{3 {a}^{2} \sqrt{3} }{2} = \frac{3 \times {5}^{2} \sqrt{3} }{2} = \frac{75 \sqrt{3} }{2} {cm}^{2} [/tex]