Question

Cine ma ajuta la niste exercitii si imi explica cum se da coroana....va primii una...uite exercitiile

Answer 1

7.
DO=OB
DM=AM   ⇒ MO linie mijlocie in triunghiul ADB  ⇒ MOIIAB si MO=AB/2⇒
m(∡MOD)=m(∡ABD)  
tg (∡MOD)=DM/MO=1/4


8.
tg (∡ABD)=1/4
tg (∡ABD)=AD/AB=1/4     AB=4AD
(4AD)²+AD²=17    16AD²+AD²=17    17AD²=17   AD²=1   AD=1
AB=4×1=4    ⇒AB=CD=4 cm

9.
A(MOC)=MO×AD/2= 2×0,5/2=0,5 cm²
MO=AB/2=4/2=2 cm
AD=1/2=0,5 cm