In △ ABC, Ao, Bo, CO intersect at a point O, ∠ Bao = ∠ Cao, find what triangle △ ABC is There is a three minute time limit

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• 1. If O is the outer center of the acute triangle ABC and Ao, Bo and co intersect with L, m and N respectively, then Ao: Al + Bo: BM + CO: CN=
• 2. It is known that the triangle ABC is an isosceles triangle with an angle of 3 = 105 ° and the degree of angle 2 and angle 1 On the course evaluation
• 3. The triangle ABC is isosceles triangle, ∠ a = 86 °, 1 = 2, 3 = 4, find the degree of ∠ 5
• 4. In the isosceles triangle ABC, if the ratio of degree between ∠ A and ∠ B is 5:2, then the degree of ∠ A is? Urgent need
• 5. If ∠ a = 4 ∠ B in the isosceles triangle ABC is known, the degree of ∠ C can be obtained
• 6. P is a point on the BC side of the triangle, and PC = Pb. Given that the angle ABC is equal to 45 degrees and the angle APC is equal to 60 degrees, calculate the degree of the angle ACB?
• 7. As shown in the figure, P is a point on the side BC of △ ABC, and PC = 2PB. It is known that ∠ ABC = 45 ° and ∠ APC = 60 °, then the degree of ∠ ACB is___ °．
• 8. As shown in the figure, it is known that P is a point on the side BC of △ ABC, and PC = 2PB. If ∠ ABC = 45 ° and ∠ APC = 60 °, find the size of ∠ ACB
• 9. As shown in the figure, P is a point on the side BC of △ ABC, and PC = 2PB. It is known that ∠ ABC = 45 ° and ∠ APC = 60 °, then the degree of ∠ ACB is___ °．
• 10. As shown in the figure, it is known that P is a point on the side BC of △ ABC, and PC = 2PB. If ∠ ABC = 45 ° and ∠ APC = 60 °, find the size of ∠ ACB
• 11. It is known that in the triangle ABC, O is any point in the triangle, and the extension lines of Ao, Bo, CO intersect the opposite sides of D, e, F Verification: AE / EC + AF / FB = AO / OD
• 12. Plane α‖ plane β, △ ABC is in plane β, three lines AA ', BB', CC 'intersect at a point P, and P is between plane α and plane β, if BC = 5cm, AC = 12cm, ab = 13cm, PA': PA = 3:2, calculate the area of △ a 'B' C '
• 13. As shown in the figure, a, B and C are three points that are not on the same straight line, AA ′‖ BB ′‖ CC ′, and AA ′ = BB ′ = CC ′. Prove: plane ABC ‖ plane a ′ B ′ C ′
• 14. There is a point O in the equilateral triangle ABC, the angle AOB = 113 ° and the angle BOC = 123 ° to find the degree of the three internal angles of the triangle with AO, Bo and CO as sides
• 15. In the triangle ABC, ab = AC, O is a point in the triangle ABC, angle OCB = angle OBC, and angle a = 40
• 16. It is known that, as shown in the figure, OA bisects ∠ BAC, ∠ 1 = ∠ 2
• 17. Given that OA = (- 1,8) ob = (- 4,1) OC = (1,3) in the rectangular coordinate plane, it is proved that △ ABC is an isosceles triangle
• 18. The average number of ABCD is 13.5, the average number of ABC is 12, the average number of BCD is 15, and the average number of CDA is 14?
• 19. Q: ABC × 4 = CDA, how much is ABCD for
• 20. Corresponding edges of △ ABC ≌ △ CDA, AB and CD, BC and DA, write other corresponding edges and corresponding angles