Question

Numai subiectul 4


85 de puncte

Answer 1

1.ABC Isoscel==> <Abc = <ACB=X

==>2x=180⁰-36⁰

2x=144⁰

x=72⁰

==><ABC=<ACB=72⁰

==>BM=Bisectoare==> <ABM=36⁰

==>ABM Isoscel==> <BAM=<ABM=36⁰

==> <AMB=108⁰

<AMB+<BMC=180⁰

==><BMC=72⁰==> BMC ISOSCEL==>BMC=BCM==>BM=BC=6CM

==>ABM Isoscel BM=AM=6 cn

2.ACB=30⁰==>AB=BC/2==>BC=2AB==>BC=10×2==>BC=20

AM mediana==>AM=10CM==>CM=10CM

BAD Dreptunghic;D=90⁰==> <BAD=30⁰==>BD=AB/2==> BD=5CM==>BD+CD=20CM==>DC=15CM