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ABC is an equilateral triangle. If m∠DAC = m∠DCA = 40°, cho
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08 Jan 2021, 10:30
08 Jan 2021, 10:30
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Question Stats:
45% (01:56) correct
54% (02:13) wrong based on 64 sessions
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\(\triangle{ABC}\) is an equilateral triangle. If \(m∠DAC = m∠DCA = 40°\), choose all the true statements.
A. AD = DC
B. AD < BC
C. m∠DAB = m∠DCB
D. m∠ADC > m∠DCB
E. CE = EA
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Official Answer
A,B,C,E
Re: ABC is an equilateral triangle. If m∠DAC = m∠DCA = 40°, cho
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18 Jan 2021, 19:19
18 Jan 2021, 19:19
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By geometrical properties of triangles, A,B,C are true;
For E, since, as non-vertex angles are equal, consecutive sides are equal, this figure is considered as a kite. Non-vertex side diagonal is bisected by diagonal from the vertex side.
For E, since, as non-vertex angles are equal, consecutive sides are equal, this figure is considered as a kite. Non-vertex side diagonal is bisected by diagonal from the vertex side.
Re: ABC is an equilateral triangle. If m∠DAC = m∠DCA = 40°, cho
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21 Jan 2021, 12:37
21 Jan 2021, 12:37
why option d is wrong?
after calculation measure of angle BCD =100 and angle ADC=120
after calculation measure of angle BCD =100 and angle ADC=120
