Question

Va rog frumos , este pt.maine!!!!! dau coronita!!!!!

Fie triunghiul ABC, m(unghiului A)=90 grade si AD perpendicular BC, D apartine BC.
a) Daca AD=0,5 m si BC=20 dm, calculati AB x AC;
b) Daca BC=35 cm si CD=4 BD, calculati BD, DC, AD.

Answer 1

0.5m =5 dm
AD =AB*AC /BC
5 =AB*AC/20
AB*AC =5*20 =100 dm
b)
1BD+4BD =35
5BD =35
BD =35:5 =7 dM
CD =4*BD
CD =4*7 =28 dm

AB^2=BC*BD
AB^2 =35*7 =245
AB= radical 245 =15.65 dm

AC^2 =BC*DC
AC^2 =35*28 =980
AC =rad> 980 =31.30 dm

AD =AB*AC/BC
AD =15.65 *31.30 /35 =489.84/35 =13.99 ~  14 dm