Երկրաչափություն

 

Թեմա 1

 

1.  BD=17սմ   DC=25սմ   BC=?

 

Դեպք 1

 

 

 

BC=BD+DC=42սմ

 

Դեպք 2

 

 

BC=DC-BD=8սմ

 

3.

 

 

<AOC-<AOb=42°                                                                                           2<AOB=138°

<AOC=<AOB+42°                                                                                           <AOB=69°

<AOC+AOB=180°                                                                                            <AOC=<AOB+42°=111°

<AOB+42°+<AOB=180°

<AOB=180°-42°

 

 

 

4.

 

 

 

 

 

<AOC+BOC=96°  44ր

<AOC=48° 22ր

<BOC=<AOD=180°-48° 22ր=179° 60ր-48° 22ր=131° 38ր

 

 

 

5.

 

 

 

 

 

MOP+PON=180°

<mor=90°?/2=45°

<POR=<POM+<MOR=90°+45°=135°