HUI ped cyUKCOM -er: wig talk 14. Who are they? Look at these pictures and to your friend. Ask and answer - id1142332120220221 от marinapizdec 21.02.2022 18:58

Question

Геометрия: HUI ped cyUKCOM -er: wig talk 14. Who are they? Look at these pictures and to your friend. Ask and answer questions about them. Who is taller than ... ? Who s got longer hair than ... ? Who s got smaller feet than ... ? Who is older than ... ? tall, fat, short, long, small, kind, nice, old​

marinapizdec · Accepted Answer

ответ: Дано:

∆АВС - рівнобедрений; АС - основа; BD - бісектриса;

М є BD. АВ ‖ ME; ВС ‖ MF. Довести: DE = DF.

Доведения:

За умовою ∆АВС - рівнобедрений (АВ = ВС).

За умовою BD - бісектриса.

За властивістю piвнобедреного трикутника маємо: BD - висота.

BD ┴ АС, тобто ∟MDE = ∟MDF = 90°.

За властивістю кутів р1внобедреного трикутника маємо: ∟A = ∟C.

За умовою АВ ‖ ME; AC - січна, тоді за ознакою паралельності прямих маємо: ∟BAC = ∟MEC (відповідні).

Аналогічно: MF ‖ ВС; АС - січна, ∟BCA = ∟MFA.

Якщо ∟A = ∟C; ∟A = ∟MED; ∟C = ∟MFD, тоді ∟MEF = ∟MFE.

Тодф ∆EMF - рівнобедрений. MD - висота, тоді MD - медіана, отже DE = EF.

Доведено.

Объяснение:

HUI
ped cyUKCOM -er: wig
talk
14. Who are they? Look at these pictures and
to your friend. Ask and answer questions about them.
Who is taller than ... ? Who's got longer hair than ... ?
Who's got smaller feet than ... ? Who is older than ... ?
tall, fat, short, long, small, kind, nice, old

MOGZ ответил

HUIped cyUKCOM -er: wigtalk14. Who are they? Look at these pictures andto your friend. Ask and answer questions about them.Who is taller than ... ? Who's got longer hair than ... ?Who's got smaller feet than ... ? Who is older than ... ?tall, fat, short, long, small, kind, nice, old​

MOGZ ответил

HUI
ped cyUKCOM -er: wig
talk
14. Who are they? Look at these pictures and
to your friend. Ask and answer questions about them.
Who is taller than ... ? Who's got longer hair than ... ?
Who's got smaller feet than ... ? Who is older than ... ?
tall, fat, short, long, small, kind, nice, old