3:39
The most fundamental concepts of geometry: point, line, line segment, ray | 1
30 views • 10 days ago
4:50
Parallel lines, transversal, corresponding angles, alternate angles, consecutive angles | 1
22 views • 2 weeks ago
2:08
The three basic trigonometric ratios: sine, cosine, tangent | SOH CAH TOA | Trigonometry | 1
50 views • 3 weeks ago
2:05
Complementary angles, supplementary angles, explementary angles | Geometry | Trigonometry | 1
23 views • 1 month ago
2:15
Classifying angles by size | Geometry | Trigonometry | 1
30 views • 1 month ago
2:08
Surds are commonly found in geometry, e.g. √2 is the length of the diagonal of a square with... (v2)
41 views • 2 months ago
1:42
Surds are commonly found in geometry, e.g. √3 is the length of the altitude of an equilatera... (v1)
29 views • 2 months ago
1:38
The conic sections: the circle, the ellipse, the parabola and the hyperbola | 1
53 views • 3 months ago
3:12
Phrasal verbs with "up" | Conversational English | Improve your grammar & vocabulary | 2
32 views • 3 months ago
7:13
Irregular verbs | English language and linguistics | Improve your grammar | 1
26 views • 3 months ago
11:15
Conditionals | If-clauses | Conversational English | Improve your grammar | 1
128 views • 3 months ago
2:44
Third conditional | If-clauses | Conversational English | Improve your grammar | 1
22 views • 3 months ago
3:00
Second conditional | If-clauses | Conversational English | Improve your grammar | 1
37 views • 3 months ago
3:00
First conditional | If-clauses | Conversational English | Improve your grammar | 1
50 views • 4 months ago
3:00
Zero conditional | If-clauses | Conversational English | Improve your grammar | 1
26 views • 4 months ago
15:33
Present tense: present simple, present continuous, present perfect, present perfect continuous | 1
68 views • 4 months ago
4:24
Animals | English language and linguistics | Improve your vocabulary | 2
25 views • 4 months ago
8:47
Conjunctions | English language and linguistics | Improve your grammar and vocabulary | 2
154 views • 5 months ago
9:36
Modal verbs | Conversational English | Everyday conversations | Improve your grammar | 1
180 views • 5 months ago
4:02
The past simple tense | English language and linguistics | Improve your grammar | 1
24 views • 6 months ago
3:59
The future simple tense | English language and linguistics | Improve your grammar | 1
12 views • 6 months ago
4:00
The present continuous tense | English language and linguistics | Improve your grammar | 1
23 views • 6 months ago
4:01
The present simple tense | English language and linguistics | Improve your grammar | 1
69 views • 7 months ago
4:00
The present perfect tense | English language and linguistics | Improve your grammar | 1
91 views • 7 months ago
4:01
The present perfect continuous tense | English language and linguistics | Improve your grammar | 1
100 views • 7 months ago
3:22
Proper nouns: the planets of our solar system | English language | Improve your vocabulary | 1
81 views • 7 months ago
3:12
Proper nouns: the continents of the world | English language | Improve your vocabulary | 1
32 views • 7 months ago
4:24
Animals | English language and linguistics | Improve your vocabulary | 1
47 views • 7 months ago
8:47
Conjunctions | English language and linguistics | Improve your grammar and vocabulary | 1
142 views • 8 months ago
3:34
Adverbs | English language and linguistics | Improve your grammar and vocabulary | 2
52 views • 9 months ago
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