Tolong bantu jwb para senior.

a.)

Pake rumus pitagoras

(Sisi miring)² = (alas)² + (tinggi)²

[tex]s {}^{2} = a{}^{2} + t {}^{2} \\(y + 4) {}^{2} = y {}^{2} + 16 {}^{2} \\ y {}^{2} + 8y + 16 = y {}^{2} + 256 \\ y {}^{2} - y {}^{2} + 8y = 256 - 16 \\ 8y = 240 \\ y = \frac{240}{8} \\ y = 30 \: cm[/tex]

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b.)

Luas segitiga :

[tex]L = \frac{a \times t}{2} \\ L = \frac{y \times 16}{2} \\ L = \frac{30 \times 16}{2} \\ L = 240 \: cm {}^{2} [/tex]