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- Hình tam giác có ba góc nhọn là tam giác ABC
- Hình tam giác có góc vuông là tam giác DEG
- Hình tam giác có góc tù là tam giác MNP
- Hình tam giác có ba góc nhọn là tam giác ABC
- Hình tam giác có góc vuông là tam giác DEG
- Hình tam giác có góc tù là tam giác MNP
Xét tam giác ABC có
Vậy tam giác ABC là tam giác vuông.
Xét tam giác DEF có:
Vậy tam giác DEF là tam giác tù.
Xét tam giác HIK:
Nhận thấy
Vậy tam giác HIK là tam giác nhọn.
a: ΔABC, ΔAHB,ΔAHM, ΔAMC
b: 1 góc tù: ΔAMC
1 góc vuôg: ΔAHB; ΔAHC
a) Vì tổng 3 góc trong tam giác là \({180^o}\)
Nên ta có :
\(\begin{array}{l} \Rightarrow \widehat {DEC} + \widehat {DCE} + \widehat {CDE} = {180^o}\\ \Rightarrow \widehat {DCE} = {180^o} - \widehat {DEC} - \widehat {CDE}\\ \Rightarrow \widehat {DCE} = {180^o} - {58^o} - {32^o} = {90^o}\end{array}\)
b) Theo đề bài ta có :
\(\begin{array}{l} \Rightarrow \widehat {HGF} + \widehat {GHF} + \widehat {GFH} = {180^o}\\ \Rightarrow \widehat {GFH} = {180^o} - \widehat {HGF} - \widehat {GHF}\\ \Rightarrow \widehat {GFH} = {180^o} - {68^o} - {42^o} = {70^o}\end{array}\)
c) Theo đề bài ta có :
\(\begin{array}{l} \Rightarrow \widehat {IJK} + \widehat {JKI} + \widehat {JIK} = {180^o}\\ \Rightarrow \widehat {JIK} = {180^o} - \widehat {IJK} - \widehat {JKI}\\ \Rightarrow \widehat {JIK} = {180^o} - {27^o} - {56^o} = {97^o}\end{array}\)
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- Hình tam giác MNP có ba góc nhọn .
- Hình tam giác ABC có góc vuông .
- Hình tam giác DEG có góc tù .
cảm ơn bạn đã trả lời câu hỏi của mình