1. If \( a=3 \sqrt{3} \) in the right triangle below, what is the value of \( b \) ?

A ladder is leaning against a wall. If the base of the ladder is 7 meters from the wall and the ladder is 25 meters long, how high up the wall does the ladder reach?

293. Calcola la misura dell'altezza di un rombo che ha il perimetro di 120 dm e le diagonali di 36 dm e 48 dm . [28,8 d

S, ASA, and AAS Congruence two triangles are congruent. If they are, state how you know.

13. Sean el plano \( \pi \equiv 2 x+k y+z-6=0 \) y la recta \( r \equiv\left\{\begin{array}{l}x=2 t \\ y=2+6 t \\ z=2-4 t\end{array}\right. \) a) ¿Para qué valor de \( k \) la recta es paralela al plano? b) Para \( k=2 \), halla el ángulo que forman el plano \( \pi y \) la recta \( r \).

À l'aide du triangle RST ci-contre, prouver que la longueur ST d'un escalator est de \( 13,6 \mathrm{~m} \).