luas
$$ L = \frac{a b}{2} = \frac{c t_c}{2} $$
keliling
$$ K = a + b + c $$
teorema Pythagoras
$$ c^2 = a^2 + b^2 $$
tinggi ke sisi c
$$ t_c = a \cdot\sin\beta = b \cdot\sin\alpha $$
sudut
$$ \alpha + \beta = 90^\circ $$
fungsi trigonometri
$$
\begin{aligned}
\sin\alpha &= \frac{a}{c} \\ \\
\cos\alpha &= \frac{b}{c} \\ \\
\tan\alpha &= \frac{a}{b} \\ \\
\cot\alpha &= \frac{b}{a}
\end{aligned}
$$
$$
\begin{aligned}
a^2 &= c \cdot c_a \\ \\
b^2 &= c \cdot c_b \\ \\
t_c^2 &= c_a \cdot c_b
\end{aligned}
$$
